Die-casting machine



Aug. 2s, 1923. 1,466,49@ O. L. W. SWENSON DIE CASTING MACHINE 1o "8 185'51 u l 29 B4 E C) m .3 l; ,1Q 525 \'7 u /55 f 'im I@ 4 a mnu'lnl'mN15`I'Im mum INL W44 l 1@ 13 1 8 215| 2.4. Q INVENTOR.

Aug. 28, 1923.

o. L. w. sWENsoN DIE CASTING MACHINE 4 Sheets-Sheet 2 Filed Aug. 4, 1921FM; 2J;

INVENTOR.

ATTORNEY.

1,466,490 o. L.. w. swENsoN DIE CASTING MACHINE' Filed Aug. 4. 1921 4Sheets-Sheet 5 Aug. 28, 1923.

13 14.-' 1 INVENTOR.

ATTORNEY.

1,466,490 O. L. W. SWENSON DIE CASTING MACHINE Filed Aug. 4. 1921 4Sheets-Sheet 4 A TTORNE Y.

Patented Aug. 28, 1923.

Ferca.

DIE-CASTING- MACHINE.

Application led August'll, 1921. Serial No. 489,769.

To all whom z't may concem Be it known that I, OSCAR L. W. SWEN- soN, asubject of the King of Sweden, and a resident of No. 774 57th Street,borough of Brooklyn, county of Kings, city and State of New York, haveinvented a certain Die- Casting Machine, of which the following is aspecification.

This invention relates to die casting machines, and especially to thatclass wherein a rearwardly pivoted ladle is adapted to move in opposedsynchronism with the movable parts of a superposed pneumatic ram, and itis one object of this invention to simplify the operation of die castingmachines in order to eliminate labor and speed up production of diecastings.

.Another object is to provide a pair of rocker arms upon the sides of acasting lire box which at one extremity are connected to ladlesupporting and controlling links, and at their other extremities to asimilar pair of links pendant from a vertically movable die-plate abo-vesaid fire box.

A further object is to provide an air pressure nozzle attached to avertically movable die-plate and adapted to meet the receiving cup of aladle when the latter is in raised position.

Further objects and attained advantages will become apparent as thisspecification proceeds. l

Referring to the drawings, Fig. 1 is a view of an apparatus embodyingthe present invention. l

Fig. 2 is another view of the same with the principal parts in section.

. Fig. 3 'is another section of val-ve spindle 41 of Fig. 2.

Fig. 4 is a similar view to Fig. 2.

Fig. 5 is a sectional view of the lower portions of Figs. 1, 2 and 4.

Fig. 6 is a plan `view of the` same parts.

Fig. 7 is a plan view of disk 9 of the Figs. 1, 2 and 4.

Fig. 8 is a horizontal section of die-plate 2 of the same views.

Throughout vthe drawings, the same numerals `refer to the same oridentical parts.

In the practice of my invention a fire-.box l is mounted on a base plate22 and supports the superstructure including a die-plate 2 through whichpass several vertical tie rods 5 5, 55, two of the latter being securedin holes '68. 68 of the fire box top.

A cylinder block 12 is secured to these rods and is formed above into aram cylinder 33, and at the side into a smaller cylinder 37. A piston 60is adapted to rise and fall in the large cylinder and is provided with arod 61 which is secured to the movable die-plate 3, the latter inmovement riding upon the mentioned vertical tie-rods. In the air chamber63 of the smaller cylinder a small piston 62 is adapted to slide, thepiston being hollow and having pipe extension 18 which is se- -cured todie-plate 3 and passes through the latter lterminating in a nozzle 19.

At the left corners of the same side of the die plate are connected apair of pendant links 13, 13 each of which is in turn connected to arocker arm, as seen at 20.

The rocker arm is pivoted to a stud 21 on the base 22, and a shorterlink 14 connects the short arm of the rocker with a ladle 15, a shaft 23passing through the short links andthe ladle hearings, one of which isnoted 23. The ladle itself is pivoted at 17 on the fire-box or furnace1, and is' provided with an air cup 16 which communicates with theinterior of the ladle.

The ladle is, of course, partly immersed in the molten metal 50contained in 'the po-t 49.

The fire-box is lined interiorly with fire brick noted 56, 56, anaperture 67 permitting lthe insertion of a Afuel pipe and burner.

beneath the melting pot. The fioor of the box isarched as at 64` tothrow the flames against the pot, while a central outlet 65 and passagel66 are adapted to carry off the exhausted gases.

As the form of gasfburner used is no actual.

part of my invention, the burner has been omitted, especially` as thecommon apparatusy for the purpose is well known.

The dies 4 and 5 are opened andclosed by air pressure exerted uponpiston 60, air also being used to force metal from the ladle into thedies at 6, the supply pipe38 connecting with valves` 30` and 35 toaccomplish these operations.

To operate the machine, the leverv29of valve 30 is pushed so that thevalve piston 41 occupies the position shown in Fig. 2, when the air maypass through channel 42 from the pipe 38 into cylinder 58 through pipe31. The piston 60 is raised by the incoming air, and will raise the dieplate 3 and its die 5 to the position shown in the mentioned view.

However, the links 13, 13 will also be drawn up to a raised position,rocking arm 20 so that links 14 will permit the ladle 15 to submerge itsnozzle 53 in the molten metal in order to fill the ladle with a charge.

If the same lever is now drawn momentarily from the retracted positionof Figs. 2 and 4 to that shown in Fig. 1, the piston ,will be forceddown by air entering chamber 59 from pipe 32. The vertical position ofthis pipe and the exhaust nozzle 44 are set back a little to escapelying in the same plane with pipes 31 and 38, necessitating a channel 45in the valve piston 41 to connect the channel 42 with said vertical pipewhen moved into the mentioned position. In Fig. 3 another section of thevalve piston is shown along the deeper plane ot pipe and nozzle 44.

This view reveals the exhaust channel 46, the part being in 'exactly thesame position as in Fig. 2, wherein the channel or groove 43 is visiblewhich connects with the exhaust channel. By this construction, chamber58 will exhaust out through its pipe 31 and nozzle 44 while chamber 59fills from its pipe 32, and vice versa- When the large piston and itspreviously mentioned appurtenances have descended into the positionshown in Fig. 4, the links 13, 13 being now in low position, the rockerarm 20 is seen in locked or rigid position, while the ladle is in itshighest position. In order to assure rigidity of the dies while casting,a plurality of vertical locking bars 7, 7, 7 have been secured todie-plate 3, and a partly rotatable locking plate 9 supported upon ashelf 8 and centered in movement by the hub 57 extending into thehole`70 of the plate. The latter plate is provided with a projectingrack 10, while` a lever 11 is mounted upon the block 12 and engages therack by means of its sector teeth.

Normally, the locking plate occupies a neutral position in which thebars or rods 7, 7 may pass up through corresponding holes 69. 69, 69 inthe plate and up through block 12. However, when the lever 11 is drawndown, the plate Will be slightly rotated, presenting the unbroken faceof the plate immediately above the upper extremities of the rods, thuslocking them and simultaneously the whole machine in rigid position.

If at this point the lever 34 of the upper valve 35 is drawn into theposition shown in Figs. 1 and 4, air will pass through channel 40 invalve piston 39, through pipe 36, down into chamber 63 of cylinder 37and thence down pipe 18.

It may be noted that in this position the nozzle 19 meets receiving cup16, and that the compressed air will proceed from pipe 18 down throughthe nozzle and cup into chamber 15 in the ladle. When the air presses onthe contents of the ladle, molten metal will be forced up through nozzle74, and into the dies through receivingnozzle 48.

As this operation is but the work of a moment, the lever 34 isimmediately returnedto original position and likewise the locking lever11. Then the lever 29 may be pushed to the left to raise the die 5,permitting a casting 6 to be removed, the ladle having meanwhiledescended into the melting pot.

In Fig. 1, without regard to the position of the valve levers, theinitial rising and opening position may be seen.'

Ihe link 13, as is clearly shown has upon its lower leg a cam block 47provided with a cam slot 26.

At the upper extremity of this slot a little depression is adapted toretain the stud 25 of rocker arm 20 when the cam block is pressed towardthe right. In order to perform this feature, whose utility will bepresently explained, a .spring frame 28 having a flat projection 28 ismounted on the rear of base 22 and provided with a spring 51. An idler27 is also pivoted to the base, having a roller 54 adapted to engage thecurved edge of block 47, While an extension 53 upon the idler receivesthe pressure of the spring on one side and is adapted to engage stopstud 52 on the other.

In raised position, the rocker arm, as seen in Fig. 2 is adapted byvirtue of the projection 24 to force the cam block toward the left tofree the stud 25 and permit the link to pass upward without definiteengagement. The result attained is that the initial break between theair nozzle and its cup occurs simultaneously with the break between theladle nozzle and the die, and immediately thereafter a delay in themovement of the air nozzle While the ladle nozzle increases itsdistance, the pressure being vthus released from the ladle. l

During the operation of the machine, the die-plate 2 is very likely tobe overheated, and a water channel 72 has therefore been cast into theplate enveloping the nozzle hole 71 and adapted at 73 for connectlonwith circulation pipes. It is, of course obvious, that different sizesof dies may be secured and used in my machine, but while the die-plate 3and the piston always rlse to the same position this diii'erence in dieswill cause the down position to be different for each particular pair ofdies. In order to attain proper filling and discharging positions forthe ladle under these di'ering conditions, the links 13 and 14 areprovided with adjustment blocks 13 and 14', respectively by the turningand setting of which these changes may be compensated.

It is also obvious that by using a small hollow piston on the air pipefor the ladle with a corresponding cylinder, the common troublesomeflexible hose is avoided, while the machine as a whole is compact, selfcontained, very convenient to operate and well nigh automatic inoperation.

Having thus fully described my invention, I claim l. A die castingmachine including a lire box and apneumatic ram surmounting the same,said ram having a movable ram mem.- ber, a ladle provided with arearward arm pivoted upon the rear of said lire box, a rocker arm uponthe same re box, a link connecting said movable ram member with oneextremity of said rocker arm, a shaft secured to said ladle, and a linkconnecting said ladle shaft with the other extremity of said rocker arm.

2. A die casting machine includinga fire box and a. pneumatic. ramsurmounting the same, a movable die plate in said ram, a rearwardlypivoted ladle adapted to rise to a die nozzle below said ram, a shaftsecured to said ladle and a pair of adjustable links connected at theirupper extremities to said shaft, and at their other extremities to apair of similar rocker arms pivoted to said fire box, and a seco-nd pairof adjustable links connected at their lower extremities to the otherends of said rocker arms and at their upper extremities to said movabledle late. p 3. A die casting machine including a pneumatic ramsurmounting a fire box and provided with a movable die plate, a ladleprovided with a transverse supporting shaft, a link connected at one.extremity to said shaft and at the other to a rocker arm, a stud uponanother portion of said rocker arm, a second link connectedat-oneextremity to said movable die plate, a cam block upon the otherextremity of said second link. there being a slot for said rocker armstud in said cam block aligned with the link and 'a depression to retainsaid stud in the inner extremity of the slot in the cam side of said camblock, means to retain said stud in said depression including upon saidlire box a spring actuated idler having a roller adapted to contact withthe said cam block, and means to tree and pro-ject said rocker arm studinto the main slot of said block including upon said rocker .arm aprojection. adapted to strike said cam block located between said studand the p-ivot of said arm.

4. A die casting machine including a fire box surmounted by a pneumaticram, a movable die plate co-nt-rolled by the latter, a stationary dieplate below said movable die plate, a pivoted ladle adapted to rise andfall in a manner corresponding to the fall and rise of said die plate,an air receiving cup upon said ladle communicating withthe interiorthereof and an air nozzle vsecured to said die plate, connected to asource of air pressure supply and adapted upon'descent of said die plateto meet said ladle cup and register therewith.

5. A die casting machine including a pneumatic ram surmounting a firebox, a movable die plate in said ram, a ladle adapted to rise and falland provided with an air cup, an air supply cylinder secured to saidram, parallel therewith, an air nozzle secured to said die plate andadapted upon the descent of the latter to register with and meet saidladle cup, a hollow piston in said air cylinder, and a rigid pipeconnecting said nozzle with said hollow piston.

6. A die casting machine including a pneumatic ram having a movable dieplate and a stationary ram cylinder plate, a second stationary platesecured in spaced osition from said cylinder plate, paralel therewithand between the same and said movable die plate, a plurality of lockingrods secured upon said die plate parallel with the axis of the ramcylinder, and adapted upon movement of said die plate to pass up throughapertures in both stationary plates and to clear said ram cylinder, arotatable perforate locking plate between said stationary platescentered upon a hub projecting from one of said plates, and means torotate said locking plate including a rack upon a portion of the plateand a lever upon said ram cylinder plate having a gear segment engagingsaid rack and adapted upon movement to partly rotate said locking plateand present imperforate portions thereof above the. free extremities ofsaid locking rods to block movement of the latter and lock the die platein down position.

7. A die casting machine including a ram having a. cylinder and beyondit a movable die plate, a second cylinder parallel with said firstcylinder, a ladle provided with an open air receiver, an air supplynozzle secured to said die plate and adapted to engage said air receiverin projected positionof said die plate, and a pipe connected to said airnozabove said cup, a' pair of bearings on either city and State of NewYork this 2nd day side of said ladle for a transverse shaft and ofAugust, 1921.

a rearwardly projectino arm beyond said -1 1 .y T cup aligned with theldle and 'forming a bCAh L' l" SNEB 50N' 5 rear support therefor.Witnesses:

Signed at 132 Nassau Street, in the bor- EDWARD CHILSTROM,

'ough of Manhattan, county of New York, CLoEs BRUNsoN.

